baoshi-was/app/Tutorial.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Tutorial extends Model
{
    protected $fillable=[
        'owner_id','name','content','type'
    ];
    protected $appends=[
        'owner_name'
    ];

    public function owner(){
        return $this->belongsTo('App\Owner','owner_id','id');
    }

    public function getOwnerNameAttribute()
    {
        $this['owner']? $this['owner']['name']:null;
    }
}